the passage by which air reaches a person's lungs (通向肺的)气管 ■a tube for supplying air to a person's lungs in an emergency (应急时把空气导入肺部的)导气管 ■a ventilating passage in a mine (矿井的)通风道
a recognized route followed by aircraft 空中航线 ■(Airways)in names of airlines [用于名称]航空公司 British Airways. 英国航空公司。